Francis turbine

A Francis turbine is a type of hydropower reaction turbine that contains a runner that has water passages through it formed by curved
vanes or blades. The runner blades, typically 9 to 19 in number, cannot
be adjusted. As the water passes through the runner and over the curved
surfaces, it causes rotation of the runner. The rotational motion is transmitted
by a shaft to a generator.

The Francis turbine has a wide range of applications and can be used for
fall heights of 2–800 meters. The largest Francis turbines have an output
of 750 MW. Compare with Kaplan turbine and Pelton turbine.